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    "# 购物车练习\n",
    "## 购物车程序项目：\n",
    "\n",
    "## 要求：\n",
    "### 1、运行程序后，让用户输入支付宝余额，然后打印我们的商品列表给用户。\n",
    "\n",
    "### 2、让用户输入商品编号进行商品的购买。\n",
    "\n",
    "### 3、用户选择商品后，检查用户的余额是否够，若够则直接扣款，不够则提醒用户。\n",
    "\n",
    "### 4、用户可以随时退出购买，推出时打印用户已购买的商品和支付宝余额。"
   ]
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   "source": [
    "# 商品的数据信息\n",
    "goods_list = [\n",
    "    # [商品名称，商品价格]\n",
    "    ['珍珠奶茶',7],\n",
    "    ['大杯珍珠奶茶',8.5],\n",
    "    ['加大杯珍珠奶茶',9.5],\n",
    "    ['桶装珍珠奶茶',20]\n",
    "]\n",
    "user_shopping_car = []\n",
    "# 用户输入 使用input，结果是一个字符串\n",
    "Alipay = int(input(\"请输入你的余额：\"))\n",
    "\n",
    "while True:\n",
    "    # 循环遍历商品列表，将商品信息按照一定格式输出\n",
    "    # 一定格式：商品编号：xx，商品名称：xx，商品价格：xx\n",
    "    print(\"------ 请选择编号 欢迎选购 ------\")\n",
    "    for i in range(len(goods_list)):# range会根据商品列表的长度变化而变化\n",
    "        print(\"商品编号：%s,商品名称：%s,商品价格：%s\"%(i,goods_list[i][0],goods_list[i][1]))\n",
    "\n",
    "    # 2.让用户输入商品编号进行商品的购买\n",
    "    # 1.用户输入的内容是否符合规范（用户买的东西有没有）？\n",
    "\n",
    "    choice = input(\"请正确输入购买商品的编号：\")\n",
    "    if choice.isdigit():# isdigit 判断字符串里面的内容是否是数值\n",
    "        choice = int(choice)\n",
    "        if choice > len(goods_list):\n",
    "            #   b.如果没有该商品，返回没有\n",
    "            print(\"您选择的商品不存在\")\n",
    "        else:\n",
    "            #   a.如果有 判断金额是否够:用户金额 Alipay 商品的金额 goods_list[choice][1]\n",
    "            if Alipay > goods_list[choice][1]:\n",
    "                # 用户余额够 1.增加该商品到用户购物车 2.扣除余额\n",
    "                user_shopping_car.append(goods_list[choice])\n",
    "                Alipay = Alipay - goods_list[choice][1]\n",
    "                print(\"%s已经加入您的购物车，您的【账户余额】还有：%s元\"%(goods_list[choice][0],Alipay))\n",
    "            else:\n",
    "                print(\"您的余额不足，请更改支付方式\")\n",
    "    elif choice == \"q\":\n",
    "        # 用户退出购买\n",
    "        print(\"用户购物车：\",user_shopping_car)\n",
    "        print(\"您的余额还有：\",Alipay)\n",
    "        break\n",
    "    else:\n",
    "        print(\"请输入商品编号！！！\")"
   ]
  }
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